Examine source code of Random brilliant colors

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "brilliant colors",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-009-f069b97f439938a011297c84464f0df6.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(30, 10, 214)",
      "toolbar_text": "rgb(250, 100, 47)",
      "frame": "rgb(155, 92, 62)",
      "tab_background_text": "rgb(107, 84, 223)",
      "toolbar_field": "rgb(72, 77, 19)",
      "toolbar_field_text": "rgb(215, 133, 6)",
      "tab_line": "rgb(176, 135, 49)",
      "popup": "rgb(130, 71, 176)",
      "popup_text": "rgb(214, 44, 84)",
      "tab_loading": "rgb(176, 135, 49)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2891bdd6-67c1-4395-808b-8525f64fb27d}"
    }
  }
}